http://www.ethereal.com/ - Ethereal is a free network protocol analyser for Unix/Linux and Windows.
http://www.caching.com/ - Site with information about all things to do with Caching
http://www.nortelnetworks.com/servsup/rml/index.new.html- Tools to help configure Bay/Nortel Networks Routers

http://www.slashdot.org/ - Latest news from the world of technology (well sort of...)
http://www.happyhacker.org/ - useful information about cracking.
http://www.streamingmedia.com/ - News and information from the world of Streaming Media.

http://freshmeat.net/- good source of share/freeware
http://www.suse.com - are favourite version of Linux